Effect of α-tocopherol on oxidative stability of oil during spray drying and storage of dried emulsions
Résumé
Lipophilic compounds such as polyunsaturated fatty acids (PUFAs) and antioxidants can be encapsulated by
spray drying in order to protect and prolong their functionalities and get new handling properties. The aim of
this work was to study the effect of both the spray drying stage and storage (60 °C — 50% RH) on the oxidation
of lipophilic compounds encapsulated in spray dried oil-in-water emulsions (10% w/w oil in dry matter) using
maltodextrin as matrix and Tween® 20 as emulsifier. Emulsions were prepared with oil containing or not con-
taining α-tocopherol (482 ppm in oil) in order to also demonstrate the influence of the antioxidant.
Results showed that there is a beginning of oxidation during spray drying, evidenced by a slight increase of
markers of rancidity, i.e. conjugated dienes and volatile organic compounds. During storage, the oxidative degradation of PUFAs and α-tocopherol started quickly under the conditions of aging. This was shown to be due to the negative effect of the process and to the porosity of the solid matrix to oxygen, associated with the hollow
structure of the particles. An inhibitory action of maltodextrin on α-tocopherol was also hypothesized, but it has to be confirmed.